I printed a lot of PLA and was extremely happy with it. Then I switched to eSun PETG, which turned out to be extremely fussy. But after many days of controlled experiments, I got things tweaked to the point that PETG almost always printed well, even in a hot shop that PLA could not tolerate due to heat creep. But I needed a metallic silver, so I bought that with nGen. This morning I used the Lulzbot 5 Fine profile with fill raised from 20% to 50% for strength, and it was disaster. The first layer went down perfectly, sticking well and with neglibible strining (a major PETG fault). A few subsequent layers built up fine, with no real stringing or boogers. So I went away and came back an hour later. Yikes! The filament was one huge blob stuck to the extruder head, moving back and forth with it as more and more filament extruded. Does anyone have a thought on why this happened?
Addendum… I just noticed that Lulzbot says to use a bed temperature of 85, which is what I did, while the manufacturer’s site says 60. Maybe that’s an issue?